Electrically tunable surface-to-bulk coherent coupling in topological insulator thin films
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Steinberg-2011-Electrically tunable surface-to-bulk coherent.pdf
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Author(s)
Steinberg, Hadar
Laloe, Jean-Baptiste
Fatemi, Valla
Moodera, Jagadeesh
Jarillo-Herrero, Pablo
Date Issued
December 2011
Journal
Physical Review B
Publisher
American Physical Society (APS)
Citation
Steinberg, H. et al. “Electrically Tunable Surface-to-bulk Coherent Coupling in Topological Insulator Thin Films.” Physical Review B 84.23 (2011): n. pag. Web. 8 Mar. 2012. © 2011 American Physical Society
Version
Final published version
Abstract
We study coherent electronic transport in charge-density-tunable microdevices patterned from thin films of the topological insulator (TI) Bi[subscript 2]Se[subscript 3]. The devices exhibit pronounced electric field effect, including ambipolar modulation of the resistance with an on-and-off ratio of 500%. We show that the weak antilocalization correction to conductance is sensitive to the number of coherently coupled channels, which in a TI includes the top and bottom surfaces and the bulk carriers. These are separated into coherently independent channels by the application of gate voltage and at elevated temperatures. Our results are consistent with a model where channel separation is determined by a competition between the phase coherence time and the surface-to-bulk scattering time.
MIT Department
MIT Materials Research Laboratory
Massachusetts Institute of Technology. Department of Physics
Francis Bitter Magnet Laboratory (Massachusetts Institute of Technology)
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DOI of Published Version
https://doi.org/10.1103/PhysRevB.84.233101
